1. Department
of Polymer Science, College of Polymer Science and Polymer Engineering, The University of Akron, Akron, Ohio 44325-3909, United States
2. Institut
Charles Sadron, CNRS−Université de Strasbourg, 23, Rue
du Lœss, 67034 Strasbourg, France
3. Key Laboratory of Polymer Chemistry & Physics of Ministry of Education, Center for Soft Matter Science and Engineering, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, China